Improvement in forming joints of sheet metal



UNITED STATES PATENT OFFICE.,

J. J. LAUBACH, OF EASTON, PENNSYLVANIA.

IMPROVEMENT IN FORMlNG JOINTS OF SHEET METAL.

Sprcilication forming part of'Letters Patent No. 16,337, datedJnnuary`61857.

YTo a'ZZ whom, t may concern:

Be it known that I, J. J. LAUBACH, of Easton, in the county ofNorthampton and State of Pennsylvania, have invented a new andusefulmprovement in Machines for Glosing the Locks of Sheet-MetalPlates; and I do hereby declare that the following is a full, clear, andexact description of the same, reference being had to the annexeddrawings, making a part of this specification, in which- Figure l is aside view of myimprovement. Fig. 2 is an end view of the same.

Similar letters of reference indicate corresponding parts in the twofigures.

My invention consists in attaching a pressure-roller to the ordinarymachine used for closing the locks of sheet-metal plates, saidpressure-roller being attached .to a swinging bar, and arranged as willbe hereinafter fully shown and described, whereby the locks are pressedimmediately after being closed and before the plates are removed fromthe machine.

' To enable those skilled in the art to make and use my invention, Iwill proceed to describe its construction and operation.

A represents a base, to which an upright, B, is attached, and Crepresents a horizontal bar attached to the upright B, said'bar formingthe bed 'on which t-helock of the plates are placed.

D represents a horizontal barattached to t-he upper end ofthe uprightBthe bar I) being parallel with the bar C.

E represents a rack bar, which works through the upright B. rIhisrack-bar has a roller, F, fitted in one end of it, theperiphery of saidroller being grooved and resting upon the bar C. A pinion, F, gearsintothe rackbar, said pinion being fitted-in the upright B, andhavingits axis extending through the upright, and a crank, G, attachedto its end.

H represents a horizontal arm attached to the end of the rack-bar`gabovethe roller F.

This arm has a friction-ro ler, a, placed upon it, said roller bearingaganst the under surface of the bar D. To the outer end of the arm H apendent bar, I, is connected by a hinge or joint, b, said hinge or jointbeing so formed that the bar I is allowed to swing inward ortoward theupright B, but not outward or from it. To vthe lower end of the bar I aroller, J, is fitted.

The operation is as follows: The edges of the sheet-metal plates (shownin blue) are bent in the usual manner by any of the machines now usedfor that purpose, and the edges of the sheets or plates being locked thelock is placed upon the bar C, the rollerF being pre,- viouslymoved backnear the upright B. The roller F is then moved forward,orinthe directionindicated byarrow 1, and the edges of the roller bear upon the sheets orplates at each side of the lock and close it, the roller .L not pressingor acting upon the lock inl consequence 'of the bar I being allowed tomove inward. lengtlnthe motion of the rack-bar is reversed, and as thebar moves backward, or in the direction of arrow 2,the roller .I bearsupon the upper surface of the lock and compresses it.

The rack-bar E and roller F, arranged as herein shown, are well known,and commonly used for closing'thelocks; but the locks have beenheretofore compressed by hand with a mallet after being removed from themachine.

By my improvement theloeksare compressed claim as new, and desire tosecure by Letters Patent, is-

The roller J, attached to the pendent and swinging vlbar I, which isconnected or jointed -to the arm I-I, substantially as described, for

the purpose set forth.

` J. J. LAUBAGH.

Witiiesses:

HENRY PEAoocK, A. DE PUE.

Vhen the lock is closed its whole-

